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Weak and strong ignition. I. Numerical simulations of shock tube experiments

✍ Scribed by E.S. Oran; T.R. Young; J.P. Boris; A. Cohen

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
983 KB
Volume
48
Category
Article
ISSN
0010-2180

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✦ Synopsis

Detailed one-dimensional calculations have been pertbrmed to simulate reflected shock tube experiments in the weak and strong ignition regime in hydrogen-oxygen-argon mixtures. It is tbund that the experiments and simulations agree well in the strong ignition case studied, In the weak ignition case, the simulations show the same qualitative behavior as the experiments. Here ignition starts at a distance away from the reflecting wall at a time much earlier than the calculated chemical induction time. This latter effect is shown to arise because of the sensitivity of the chemical induction time to fluctuations in the calculation, In the calculations these fluctuations arise because of numerical inaccuracies. In experiments, they can arise from a number of sources including nonuniformities in the incident shock wave leading to nonunitbrm reflection, thermal conduction to the walls, and interactions with boundary layers.

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